Wing mirror fell off

[plainlazy]

The passenger long armed wing mirror on my 1990 MK 3 camper fell off today. The swivel pin in the arm fell out but lucky the mirror stayed on. I have been trying to find if it is possible to buy a new swivel pin, as the mirror is fine ?
I don't really want to buy a new mirror and having a look around there seems to be plenty of driver side mirror but no passenger one's for some reason. I am going to take apart the other mirror to see if I could make up some bolt set up to fix it ?
Is it possible to buy replacement swivel bolts ?